The Mapzen elevation API limits the number of queries you can make in a given time to prevent individual users from degrading the overall system performance, so very high resolutions take a long time. Remember that doubling the rows and columns will take four times as long to complete. It displays the grid of the altitudes that were obtained from the Mapzen API and shows them in red if they were above the selected altitude, or green if they were below the selected altitude. Zoom in to see how they relate to the contour line.
Let us know in the comments if you find any bugs or have suggestions for improvements. We would also love to know if anyone finds this tool useful for anything.
Timothy has been using Google Earth since when it was still called Keyhole before it was renamed Google Earth in and has been a huge fan ever since. As a result, we are not accepting new comments or questions about Google Earth. Comments I think the tool does not cope well with smaller scales. You should definitely look at extracting contours from our elevation tiles — it will be much faster than hitting the API.
More information is here:. I also just wanted only one contour line so I changed that value. The file it created — draws the contour line about meters higher than the top of the dam and floods 10 surrounding towns! Have a look at this file. I have only selected three contours: m in Green. You can easily turn on other altitudes in the KML file. I believe the water is currently around to m and the top of the dam is at m. Learn why people trust wikiHow.
Download Article Explore this Article methods. Related Articles. Article Summary. Method 1. Google Earth Pro is a more robust and downloadable version of Google Earth that runs as a desktop application that's free for personal use. Once downloaded, double-click the downloaded file to install Google Earth Pro.
Google Earth Pro can read topographical map overlays in either of these two formats. A great way to find a map is to search the web for "topographical map of region in KML format. Scroll down, click KML , and then click Download to download the map file. Click the red circle that says View and Download , type the location you're looking for, and then click the search icon to search.
Click the third icon at the top-left to toggle on the topographical map overlay. When you find a map you want, click the KMZ link to download it. You'll need to unzip the file after downloading it. Open Google Earth Pro on your computer. This opens your computer's file browser. Select the downloaded file and click Open. It's the file ending with ". You'll now see the name of the map you opened in the "Places" panel in the upper-left corner of Earth Pro.
Zoom in to the area you want to look at. Once you're zoomed in close enough, you'll see the topological map contours for the region. You can toggle the topographical map overlay on or off by checking the box next to its name under "Places. You may find it helpful to uncheck the "Terrain" option so the built-in terrain details don't interfere with the map overlay.
Method 2. Scroll down, tap KML , and then tap Download to download the map file. Once the map is rendered, tap the map you want to download in the list and select Show.
Then, tap the arrow next to KMZ to download the file. Then you'll need to unzip the file: Android: Open Files by Google or your preferred file manager , navigate to the zip file, it ends with. Then, tap the file ending with ". Open Google Earth on your phone or tablet. It's the blue-and-white globe icon labeled "Google Earth" in your app list.
Tap the Projects tab. If you don't see it on the left side of the screen, tap the three-line menu at the top-left corner first. Tap Open. It's at the top-right corner. Tap Import KML file. This opens your file picker. This imports the topographical map overlay into Google Earth.
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